Water pump



Oct. 14, 1941. w. c. c oNovER 2,259,153

WATER PUMP Original Filed June 6, 1958 ATTORNEYS.

`together'with a novel organization of water `sages whichare associatedtherewith.

Patented Oct. 14, 1941 Warren C. Conover, Waukegan, Ill., assignor toutboa`rd,'Marin`e and Manufacturing Coin pany, Waukegan, Ill., acorporation of` Dela- Wan? Original application June 6, 1938, Serial No.

212,078. Divided and this application February 4 29,1940, SerialNo.321,473

e Claims. (C1. y11aru This invention relates to improvements in outboardmotor water pumps. The present application is a division of my copendingapplication Serial No.'212,078 entitled Outboard motors, led June 6,1938, now Patent No. 2,224,900.

The primary object of my invention is to provide an improved outboardmotor waterpump pas- Furtherobjects of my inventionare to provide anovel organization of lower unit elements including the motor driveshaft, the propeller shaft, and the driving connection therebetween,whereby to simplify the construction thereof with a resultant reduction*in the cost of manufacture thereof.

Other objects of my invention will become apparent to those skilled inthe'art uponl an examination of the drawing and the following vspeci-`Iication and appended claims.

In the drawing:

Fig. 1 is a fore and aft section of an outboard motor lower unit havingmy inventive features incorporated therein.

Fig. 2 is a side elevation of the lower unit shown in Fig. 1.

Like parts are identified by the same reference characters throughoutthe several views.

The lower unit casting H0 is provided at its top with a split sleeveclamp H| tightened by means of bolt H2 on the outer shaft housing sleeve3| which terminates at the exhaust chamber H3 formed in the casting H0.At the bottom of the exhaust chamber is a socket H4 and a partition wallH5 directing the exhaust gases rearwardly into the discharge pipe H5which is bolted at the rear of casting H0 and constitutes a rearwardextension thereof, the anti-cavtation plate H8 being continuous acrossthe outside of both castings. The discharge mouth H1 for the exhaustgases is located below plate H8 and at the rear of the path of thepropeller |20.

The inner casing 32 constituting the shaft housing extends clear acrossthe exhaust chamber H3 and seats in the socket H4 where packing isprovided at |2| to prevent the exhaust gases and water from penetratingalong the drive shaft 36 into the gear chamber |23. The drive shaft hasa bearing in a bushing |24 immediately above the gear chamber. At itsend it carries the drive pinion |25 which meshes with a driven gear |26bearing in a bushing |21 provided directly in the lower unit casting H0.

Bolted to the aft surface of the lower unit casting H0 is a casting |30which provides a closure for the rear side of the gear chamberand alsoprovides a pump casing |32.` The propeller shaft "I`35"has its forwardbearing within the driven gear 26 and its 'rearward bearing in a bushingprovided in casting |30 constituting the gear casing closure. Motion istransmitted from the driven gear |26 to the propeller shaft through atorsion spring |36 having one endehtering the gear and 'the other endanchored in the pump cam |31 whichis keyed to the shaft. The torsionspring |36 is wound about the portion of the shaft intervening betweenthe gear and the cam and provides a-resiliently flexible drivingconnection calculated to absorb some of the shock to which the"`propeller may vbe subject. A shearrpin |38 passing through the shaft isengaged in a notch in the hub'of propeller |20, the hub being housed tothe pin by the nut |39 screwed to the endv of the shaft.

The pump comprises a cam follower |40 which isprovided with an extensionbearing sleeve 4| to constitute a displacement piston operating within aVcylinder which includes the bushing |42. Adjacent the cylinder the`casting |32 receives a cage |43 for a check valve |45`and` a hardenedseat |43 screwed into the cage and replaceable as required.

The wat-er inlet provided by the cage communicates through the cylinderhead |48 with the cylinder bushing |42 and with the replaceable tubularoutlet valve seat member |49. On each displacement stroke of the pistonagainst the compression of spring |50, water is forced through theoutlet valve |5| and fitting |52 into the water supply pipe 31 whichextends upwardly through the shaft housing between the inner and outertubes thereof in the manner already described. Because of the presenceof the inner tube no vibration can bring the supply pipe 31 intofrictional contact with the rotating drive shaft 36.

I claim:

1. In an outboard motor, the combination with a lower unit gear housing,of drive and propeller shafts therein, intermeshing gears mounted on therespective shafts, one of said gears being rotatable upon the propellershaft, a pump cam mounted on the propeller shaft, and a torsion springencircling the propeller shaft and having its ends connectedrespectively with the pump cam and the last mentioned gear to constitutea yielding driving connection from the last mentioned gear to said camand shaft, said cam being provided with means xing it to said shaft totransmit rotation thereto.

A means on said shaft within Vsaid chamber ex-v closure and extendingthrough said closure andY provided with a propeller externally thereof,a pump mechanism unitarily mounted in said clo' sure for application andremoval'therewith, and

tension for operating said pump mechanism.

3. In an outboard motor lower unit, the combination with a housingprovided with a gear chamber opening on one end, of a'closure appliedAto said housing and having a cavity constituting an extension of saidchamber, a displacement.

pump mounted in said closure for unitary a-pplication and removal vwithsaid closure, a propeller shaft having one end supported in said housingand its other end supported in said closure, and a cam 'carried by saidshaft Within said cavity in -operative actuating connection with saidpump, said pump being located in the plane Aof said cam'on a radius ofsaid shaft.

4. In an outboard motor lower unit, the combination with a housingprovided with a gear chamber opening rearwardly, of a closure appliedtosaid housing and having a cavity constituting a rearward extension ofsaid chamber, a displacement pump mounted in said closure, a propellershaft having its forward end supported in said housing and its rearwardend supportedy in said closureand a cam carried by said shaft withinsaid cavity in operative actuating connection'with said pump, drivingand .driven gears for said shaft'in said chamber, the driven gear beingfree of the shaft and substantially `concentric therewith, vand a springconstituting .a driving connection from the driven gear to the cam, saidcam being xed to'said shaft for the actuation thereof. v

` .fsgrnr an outboard iowerut, the combination with a housing having anexhaust chamber and a gear chamber, both opening rearwardly, of abearing between said chambers, a drive shaft in said bearing, a drivingpinion carried by the drive shaft, -a driven gear provided with amounting in the gear chamber, a'propeller shaft extending rearwardlyfrom said gear, a closure for the gear chamber within which saidpropeller shaft is mounted, a lpump cam mounted on the propeller shaftand provided with means securing it to the shaft for rotation therewith,a spring providing ayieldable driving connection fromthe driven gear tothe cam, a displacement pump comprising a cylinder formed in saidclosure and a piston reciprocable therein and bearing on said cam, asupply -pipe leading from said cylinder through said exhaust chamber,and a discharge pipe connected with said housing about said exhaustchamber to receive exhaust from said chamber for under water dischargeand .to enclose said supply pipe.

' -6I In an .outboard 'motor lower unit, the combination with a'driveshaft journalling housing provided in the upper portion thereof with anexhaust gas passage adjacent the drive shaft and extending' axiallythereof and having an upper rear wall-aperture and a lower andrearwardly opening vgear chamber, of a rearwardly projecting tubularexhaust housing attached to the shaft housing for communication with theaperture and a' water pum-p housing attached to said shaft housingbelow` the exhaust housing and 'adaptedtoprovide both a rear closure forsaid lgearchamber and supporting means for a water pump which isactuated from within the gear chamber, the lower yportion of saidexhaust housingand the upper portion of said water pump housing beingadapted to provide a downwardly projecting cavity in which is housed theupper portion of the pump and an associated check f-valve, and a tubularwater conduit leading from thevalve, through the lower wall of theexhaust housing, and into the drive lshaft housing.v

WARREN C. CONOVER.

